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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
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package org.bouncycastle.cms;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.AuthEnvelopedData;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.EncryptedContentInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Encodable;

/**
 * containing class for an CMS AuthEnveloped Data object
 */
public class CMSAuthEnvelopedData
    implements Encodable
{
    RecipientInformationStore recipientInfoStore;
    ContentInfo contentInfo;

    private OriginatorInformation  originatorInfo;
    private AlgorithmIdentifier    authEncAlg;
    private ASN1Set                authAttrs;
    private byte[]                 mac;
    private ASN1Set                unauthAttrs;

    public CMSAuthEnvelopedData(byte[] authEnvData) throws CMSException
    {
        this(CMSUtils.readContentInfo(authEnvData));
    }

    public CMSAuthEnvelopedData(InputStream authEnvData) throws CMSException
    {
        this(CMSUtils.readContentInfo(authEnvData));
    }

    public CMSAuthEnvelopedData(ContentInfo contentInfo) throws CMSException
    {
        this.contentInfo = contentInfo;

        AuthEnvelopedData authEnvData = AuthEnvelopedData.getInstance(contentInfo.getContent());

        if (authEnvData.getOriginatorInfo() != null)
        {
            this.originatorInfo = new OriginatorInformation(authEnvData.getOriginatorInfo());
        }

        //
        // read the recipients
        //
        ASN1Set recipientInfos = authEnvData.getRecipientInfos();

        //
        // read the auth-encrypted content info
        //
        final EncryptedContentInfo authEncInfo = authEnvData.getAuthEncryptedContentInfo();
        this.authEncAlg = authEncInfo.getContentEncryptionAlgorithm();

        this.mac = authEnvData.getMac().getOctets();

        CMSSecureReadable secureReadable = new CMSSecureReadable()
        {
            public ASN1ObjectIdentifier getContentType()
            {
                return authEncInfo.getContentType();
            }

            public InputStream getInputStream()
                throws IOException, CMSException
            {
                return new ByteArrayInputStream(Arrays.concatenate(authEncInfo.getEncryptedContent().getOctets(), mac));
            }
        };

        this.authAttrs = authEnvData.getAuthAttrs();

        this.unauthAttrs = authEnvData.getUnauthAttrs();

        //
        // build the RecipientInformationStore
        //
        if (authAttrs != null)
        {
            this.recipientInfoStore = CMSEnvelopedHelper.buildRecipientInformationStore(
                recipientInfos, this.authEncAlg, secureReadable, new AuthAttributesProvider()
                {
                    public ASN1Set getAuthAttributes()
                    {
                        return authAttrs;
                    }

                    public boolean isAead()
                    {
                        return true;
                    }
                });
        }
        else
        {
            this.recipientInfoStore = CMSEnvelopedHelper.buildRecipientInformationStore(
                recipientInfos, this.authEncAlg, secureReadable);
        }
    }

    /**
     * Return the originator information associated with this message if present.
     *
     * @return OriginatorInformation, null if not present.
     */
    public OriginatorInformation getOriginatorInfo()
    {
        return originatorInfo;
    }

    /**
     * return a store of the intended recipients for this message
     */
    public RecipientInformationStore getRecipientInfos()
    {
        return recipientInfoStore;
    }

    /**
     * return a table of the authenticated attributes (as in those used to provide associated data) indexed by
     * the OID of the attribute.
     * @return the authenticated attributes.
     */
    public AttributeTable getAuthAttrs()
    {
        if (authAttrs == null)
        {
            return null;
        }

        return new AttributeTable(authAttrs);
    }

    /**
     * return a table of the unauthenticated attributes indexed by
     * the OID of the attribute.
     * @return the unauthenticated attributes.
     */
    public AttributeTable getUnauthAttrs()
    {
        if (unauthAttrs == null)
        {
            return null;
        }

        return new AttributeTable(unauthAttrs);
    }

    /**
     * Return the MAC value that was originally calculated for this AuthEnveloped data.
     * @return the MAC data associated with the stream.
     */
    public byte[] getMac()
    {
        return Arrays.clone(mac);
    }

    /**
     * return the ContentInfo
     */
    public ContentInfo toASN1Structure()
    {
        return contentInfo;
    }

    /**
     * return the ASN.1 encoded representation of this object.
     */
    public byte[] getEncoded()
        throws IOException
    {
        return contentInfo.getEncoded();
    }
}